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2024 31st International Conference on Nuclear engineering, ICONE 2024

作者： Xu, Xinsheng Ye, Yiyang Zheng, Yanhua Stempniewicz Marek, M. Institute of Nuclear and New Energy Technology Collaborative Innovation Center of Advanced Nuclear Energy Technology Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education Tsinghua University Beijing100084 China CAEP Software Center for High Performance Numerical Simulation Beijing China NRG Utrechtseweg 310 Arnhem/Westerduinweg 3 Petten Netherlands

ISBN: (纸本)9780791888261

High Temperature Gas-cooled Reactor (HTGR) is recognized by the international nuclear power industry as a safe type of reactor. The modular pebble-bed high temperature gas-cooled reactor uses reactor modules with relatively small thermal power between 200-600MWt, utilizing the high-temperature resistance that can be achieved by coated fuel particles. Institute of Nuclear and New Energy Technology (INET) of Tsinghua University has developed a commercial-scale 200 MWe High Temperature gas-cooled Reactor Pebble-bed Module project (HTR-PM). The decay heat can be removed by natural mechanism, such as thermal radiation, heat conductivity, natural convection, thereby guaranteeing the safety of reactor under accident and eliminating the possibility of core melting. A passive Reactor Cavity Cooling System (RCCS) has been designed for HTR-PM to ensure the safety of the Reactor Pressure Vessel (RPV) and reactor cavity under normal operation and accident conditions. RCCS transfers heat from pressure vessels to the atmosphere through thermal radiation, heat conduction, and natural convection, and the system utilizes passive mechanism with high safety and reliability. The RCCS of HTR-PM has been designed as three independent sets. According to the preliminary design, two sets work can guarantee the safety of the PRV and reactor cavity. In this paper, the working performance of RCCS under depressurized loss of forced cooling (DLOFC) accident has been analyzed by INET with TIN-CAVCO code, and also by NRG with SPECTRA code. The analysis results of these two codes are in good agreement, proving the applicability of both codes in analysis of the HTGR as well as its RCCS. During the accidents, the maximal fuel temperature keeps below the limitation of 1620℃. The results also prove the excellent performance of the RCCS. The RCCS meets the design requirements, that is the normal operation of two sets can effectively ensure the safety of the pressure vessel and the reactor cavity during t

关键词： Gas cooled reactors

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Application of a p-version curved C^(1)finite element based on the nonlocal Kirchhoff plate theory to the vibration analysis of irregularly shaped nanoplates

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Science China(Technological sciences) 2023年第10期66卷 3025-3047页

作者： XIANG Wei NI Hua TIAN YiFeng WU Yang LIU Bo School of Mechanical Engineering Southwest Jiaotong UniversityChengdu 610031China Technology and Equipment of Rail Transit Operation and Maintenance Key Laboratory of Sichuan Province Chengdu 610031China Southwest China Research Institute of Electronic Equipment Chengdu 610036China CAEP Software Center for High Performance Numerical Simulation Beijing 100088China Institute of Applied Physics and Computational Mathematics Beijing 100088China The Solid Mechanics Research Centre Beihang University(BUAA)Beijing 100191China

Nanoplates have been widely used as elementary components for ultrasensitive and ultrafine resolution applications in the field of nano-electro-mechanical systems because of their potentially remarkable mechanical *** accurate analysis of their mechanical behavior is currently of particular interest in the function design and reliability analysis of nano-scaled *** examine the size-dependent bending and vibration behavior of nanoplates with curvilinear and irregular shapes,a new p-version curved C^(1)finite element is formulated in the framework of the nonlocal Kirchhoff plate *** newly developed element not only enables an accurate geometry representation and easy mesh generation of curvilinear domains but also overcomes the difficulty of imposing C^(1)conformity required by the nonlocal Kirchhoff plate model,particularly on the curvilinear inter-element *** examples show that this element can produce an exponential rate of convergence even when curved elements are used in the domain *** numerical results are presented for nanoplates with various geometric shapes,including rectangular,circular,elliptic,annular,and *** high accuracy of the present element is verified by comparing the obtained results with analytical and numerical results in the ***,a comprehensive parametric analysis is conducted to investigate the influences of nonlocal parameters,plate dimensions,and boundary conditions on the nonlocal behavior of *** present element can be envisaged to allow large-scale mechanical simulations of nanoplates,with a guarantee of accuracy and efficiency.

关键词： nanoplates nonlocal theory p-version finite element method C^(1)conformity irregular shape

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Parameter calibration of the tensile-shear interactive damage constitutive model for sandstone failure

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Journal of Rock Mechanics and Geotechnical engineering 2024年第4期16卷 1153-1174页

作者： Yun Shu Zheming Zhu Meng Wang Weiting Gao Fei Wang Duanying Wan Yuntao Wang MOE Key Laboratory of Deep Earth Science and Engineering College of Architecture and EnvironmentSichuan UniversityChengdu610065China Failure Mechanics and Engineering Disaster Prevention Key Laboratory of Sichuan ProvinceSichuan UniversityChengdu610065China Tianfu Engineering-oriented Numerical Simulation & Software Innovation Center Chengdu620107China

The tensile-shear interactive damage(TSID)model is a novel and powerful constitutive model for rock-like *** study proposes a methodology to calibrate the TSID model parameters to simulate *** basic parameters of sandstone are determined through a series of static and dynamic tests,including uniaxial compression,Brazilian disc,triaxial compression under varying confining pressures,hydrostatic compression,and dynamic compression and tensile tests with a split Hopkinson pressure *** on the sandstone test results from this study and previous research,a step-by-step procedure for parameter calibration is outlined,which accounts for the categories of the strength surface,equation of state(EOS),strain rate effect,and *** calibrated parameters are verified through numerical tests that correspond to the experimental loading *** between numerical results and experimental data indicates the precision and reliability of the calibrated *** methodology presented in this study is scientifically sound,straightforward,and essential for improving the TSID ***,it has the potential to contribute to other rock constitutive models,particularly new user-defined models.

关键词： Damage constitutive model Parameter calibration Rock modeling Sandstone Dynamic impact load Tensile-shear interactive damage(TSID)model

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Prediction of New Functional Fluorooxoborates with Expected Anionic Framework:A Case of CaB_(3)O_(5)F

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Chinese Physics Letters 2025年第3期42卷 85-92页

作者： Ke-Wang Zhang Wen-Qi Jin Ke Li Abudukadi Tudi Lin-Lin Liu Cong-Wei Xie Yu Xie Research Center for Crystal Materials CAS Key Laboratory of Functional Materials and Devices for Special Environmental ConditionsXinjiang Key Laboratory of Functional Crystal MaterialsXinjiang Technical Institute of Physics&ChemistryCASUrumqi 830011China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Materials Simulation Methods&Software of Ministry of Education International Center of Future ScienceKey Laboratory of Physics and Technology for Advanced Batteries(Ministry of Education)College of PhysicsJilin UniversityChangchun 130012China

The prediction of new fluorooxoborates as ultraviolet(UV)/deep ultraviolet(DUV)opto-electronic functional materials from a largely unexplored chemical space is a challenging *** has been suggested that the anionic frameworks formed by B–O and B–O–F units significantly determine the physical properties of ***,the rational design of anionic frameworks could facilitate the materials discovery ***,we propose that a candidate anionic framework can be efficiently derived from an existing one by slightly altering its oxygen *** this idea,we hypothesized the existence of a 1D[B_(3)O_(5)F]_(∞)chain from the wellknown 2D[B_(6)O_(9)F_(2_)]_(∞)***,seven CaB_(3)O_(5)F structures with the expected anionic framework were successfully ***-principles calculations show that all these structures have potential in the UV/DUV birefringent or nonlinear optical(NLO)material field,indicating that the 1D[B_(3)O_(5)F]_(∞)chain is indeed a promising anionic framework for achieving UV/DUV birefringent and NLO performance.

关键词： process borate anionic

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Design and Implementation of Script Module with Recording and Playback Function in CAE software

Design and Implementation of Script Module with Recording an...

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2023 International Conference on Computer, Artificial Intelligence, and Control engineering, CAICE 2023

作者： Wang, Jingyu Fu, Chengjie Wang, Tiejun Wang, Yuntao Chen, Liangzhong School of Aeronautics and Astronautics Sichuan University Chengdu China Tianfu Engineering-Oriented Numerical Simulation & Software Innovation Center Sichuan University Chengdu China School of Computer Science Chengdu University of Information Technology Chengdu China College of Computer Science Sichuan University Chengdu China

ISBN: (纸本)9781510665040

In large-scale engineering experiments, such as hydrodynamics and aerodynamics experiments, computer aided software (CAE) is always used to manage a large number of parameters and experimental data to simulate the physical field through finite element analysis. To improve work efficiency, one of the most practical methods at present is to record user operations in the CAE software to script files with domain specific language (DSL), such as Python, and replay those script files to reproduce user operations. In this paper, a common script module ScriptEngine supporting the recording and playback function is introduced, and it can be embedded into any CAE software to automatically complete grid division, flow field calculation, pre-processing and post-processing by running the scripts. Furthermore, a demo program embedding ScriptEngine into an opensource FastCAE was developed and the results show that running the scripts recorded by ScriptEngine could obtain the same results as the user operations and ScriptEngine can be used as a common script module in any CAE software and other desktop software which needs the recording and playback function. © 2023 SPIE.

关键词： Python

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Dynamic Interactions of Large-Scale Tandem Bubbles with a Rigid Wall

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International Journal of Mechanical sciences 2025年 297-298卷

作者： Liu, Rui Zhao, Zitong Rong, Jili School of Aerospace Engineering Beijing Institute of Technology Beijing 100081 China CAEP Software Center for High Performance Numerical Simulation Beijing 100088 China Institute of Applied Physics and Computational Mathematics Beijing 100088 China

In natural phenomena and industrial applications, bubble evolution is often governed by complex inter-bubble interactions and boundary effects. However, the evolution of tandem bubbles near boundaries has not been thoroughly investigated in existing studies. The interface-sharpening six-equation multiphase model is capable of accurately capturing rapid topology evolution at gas–liquid interfaces, enabling the prediction of complex phenomena such as bubble coalescence and collapse. In this study, the accuracy of the numerical model is validated through free-field experiment and the unified bubble theory. The numerical model simulates the evolution of single bubbles, tandem bubbles, and out-of-phase tandem bubbles near a rigid wall. The effects of inter-bubble distance (γbb ∈ [0.5, 1.6]) and out-of-phase parameter (τ ∈ [0, 1]) on bubble dynamics and wall impact are investigated, with particular attention to their influence on bubble penetration. The impact load on the wall is primarily composed of bubble collapse pressure, water-jet impact pressure, and bubble pulsation pressure. As γbb increases, the collapse mechanism of upper bubble transitions from water-jet induced mechanism to a local high-pressure induced mechanism, reaching the highest impact intensity at γbb = 1.2. As τ increases, the collapse mechanism of upper bubble gradually shifts from low-pressure bubble suppression mechanism to a local high-pressure induced mechanism. When γbb ≤ 0.9, the impact enhancement effect on the wall can be induced by adjusting the parameter τ, with the optimal impact enhancement occurring at τ = 0.833. These transitions in collapse mechanisms are further explained by the Kelvin impulse theory. The analytical conclusions provide valuable insights into the complex evolution of tandem bubbles near boundaries. © 2025 Elsevier Ltd

关键词： Multiphase flow

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General theory for designing phonon transport in alloyed/doped materials

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Science China(Physics,Mechanics & Astronomy) 2024年第12期67卷 133-140页

作者： Chenhan Liu Chao Wu Wei Liu Yunshan Zhao Gang Zhang Hongmin Yang Yunfei Chen Micro-and Nano-scale Thermal Measurement and Thermal Management Laboratory Key Laboratory of Numerical Simulation for Large Complex SystemsMinistry of EducationSchool of Energy and Mechanical EngineeringNanjing Normal UniversityNanjing210023China School of Electrical and Automation Engineering Nanjing Normal UniversityNanjing210023China Phonon Engineering Research Center of Jiangsu Province Center for Quantum Transport and Thermal Energy ScienceInstitute of Physics Frontiers and Interdisciplinary SciencesSchool of Physics and TechnologyNanjing Normal UniversityNanjing210023China Agency for Science Technology and ResearchInstitute of High-Performance ComputingSingapore138632Singapore Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments School of Mechanical EngineeringSoutheast UniversityNanjing211100China

Alloying/doping is a widely used technique for improving the electrical,mechanical,and optical properties of ***,this technology induces significant distortions in the lattice structure,mass distribution,and potential field,greatly enhancing phonon ***,we introduce the concept of alloying/doping path and employ crystal symmetry,lattice deformation,and electron distribution to characterize *** on this new concept,the phonon thermal transport behavior in alloyed/doped materials can be well designed,and along different alloying/doping paths,the difference in thermal conductivity can be up to 45 *** one hand,strategic alloying/doping that combines high crystal symmetry,large lattice contraction,and the same electron distribution suppresses phonon-phonon scattering phase space,induces phonon stiffening,and bolsters electronic structure symmetry,*** synergistic effects significantly improve thermal *** the other hand,random alloying/doping has a low symmetry,leading to the typical“U”shape of alloying/doping level-dependent thermal *** theory is corroborated in three-dimensional(3D)Si,2D MoS_(2),and quasi-1D TiS_(3),affirming its efficacy and broad applicability in controlling phonon transport.

关键词： phonon transport alloyed/doped materials crystal symmetry lattice contraction electronic structure

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Improving the Microwave Heating Uniformity of Cylindrical Samples

SSRN

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SSRN 2023年

作者： Yang, Fengming Yan, Xueting Zhu, Huacheng Yang, Yang Huang, Kama College of Electronics and Information Engineering Sichuan University Chengdu610065 China Tianfu Engineering-oriented Numerical Simulation & Software Innovation Center Chengdu620107 China

Cylindrical tubes are commonly used in microwave continuous heating sterilization. However, the cylindrical load is prone to thermal focusing, resulting in uneven heating. To solve this problem, in this study, metal rings around a cylindrical tube are proposed for uniform continuous-flow microwave heating. First, a multiphysics field model was built for microwave heating, where metal rings surround the cylindrical tube. Second, the electric field distribution, temperature distribution and reflection coefficient are analyzed to optimize the parameters of the model. Moreover, this model was designed to simulate the liquid heating effect with different dielectric coefficients. Finally, physical experiments are conducted to validate the accuracy of the simulation, showing that the experimental results are in good agreement with the simulated results. The proposed structure prevents the electromagnetic wave from focusing in the center of the cylindrical tube, improving the uniformity, and the COV was reduced by 31% (from 1.031 to 0.709) compared to the traditional method of microwave heating without metal rings. © 2023, The Authors. All rights reserved.

关键词： Microwave heating

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Fatigue reliability analysis of offshore wind turbines under combined wind-wave excitation via DPIM

arXiv

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arXiv 2025年

作者： Ding, Jingyi Chen, Hanshu Liu, Xiaoting Rashed, Youssef F. Fu, Zhuojia Center for Numerical Simulation Software in Engineering and Sciences College of Mechanics and Engineering Science Hohai University Jiangsu Nanjing211100 China Institute of Science and Technology Research China Three Gorges Corporation Beijing210098 China Department of Structural Engineering Cairo University Giza Egypt

As offshore wind turbines develop into deepwater operations, accurately quantifying the impact of stochastic excitations in complex sea environments on offshore wind turbines and conducting structural fatigue reliability analysis has become challenging. In this paper, based on long-term wind-wave reanalysis data from a site in the South China Sea, a novel direct probability integral method (DPIM) is developed for the stochastic response and fatigue reliability analyses of the key components for the floating offshore wind turbine structures under combined wind-wave excitation. A 5MW floating offshore wind turbine is considered as the research object, and a fully coupled dynamic response analysis of the wind turbine system is conducted to calculate the short-term fatigue damage value of tower base and blade root. The DPIM is applied to calculate the fatigue reliability of the wind turbine structure. The accuracy and efficiency of the proposed method are validated by comparing the obtained results with those of Monte Carlo simulations. Furthermore, the results indicate that the fatigue life of floating offshore wind turbine structures under combined wind-wave excitation meets the design requirements. Notably, the fatigue reliability of the wind turbine under aligned wind-wave condition is lower compared to misaligned wind-wave condition. Copyright © 2025, The Authors. All rights reserved.

关键词： Offshore wind turbines

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Swin Transformer-based Cross-view Attention Network for Stereo Image Super-Resolution

Swin Transformer-based Cross-view Attention Network for Ster...

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Pattern Recognition and Artificial Intelligence (PRAI), International Conference on

作者： Xue Li Hongying Zhang Laiping Zhang Zixun Ye Juntao Pu Mingdong Yuan School of Information Engineering Southwest University of Science and Technology Mianyang China Tianfu Engineering Center for Numerical Simulation and Software Innovation Sichuan University Chengdu China

Stereo image pairs offer complementary information that can improve the performance of image super-resolution reconstruction significantly. However, integrating longrange dependencies between stereo image pairs into super-resolution is challenging. This paper proposes a Swin Transformer-based cross-view attention network for stereo image super-resolution (TCASSRnet) to address this issue. Firstly, TCASSRnet extracts stereo image pair features using a Transformer with a shallow residual block (SRB). Next, a cross-view attention model (CAM) is introduced to integrate complementary features of stereo image pairs, resulting in high-frequency and low-frequency attention maps. Finally, deep residual blocks (DRBs) are employed to restore image details layer by layer and reconstruct super-resolution images. Extensive experimental results demonstrate the effectiveness of TCASSRnet. Specifically, TCASSRnet outperforms the baseline network (PASSRnet) by 0.55 dB in terms of PSNR on the Middlebury dataset for 4× SR, while the parameter size of TCASSRnet is reduced by 50% compared to the recent SSRDE-Fnet.

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